Question 718Steam Plants - Assistant Engineer

The correct answer is C) friction in the governor linkage and control valve. The governor deadband is caused by friction in the governor linkage and control valve. This friction creates a small range of engine speed where the governor does not respond to speed changes, resulting in no corrective action being taken. The deadband allows for some variation in engine speed without triggering the governor to make adjustments, which helps prevent the governor from constantly making minor corrections. The other answer choices are incorrect because they do not accurately describe the primary cause of the governor deadband. Excessive sensitivity in the control valve (A) would cause the governor to respond too quickly, not create a deadband. Speed droop (B) is a separate governor characteristic, not the cause of the deadband. Speeder spring surge (D) is not a factor in the deadband mechanism.